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the most would be 10 gauge any where between 10-14 gauge wire would be fine

Yes You run a nice thick wire from the - of the coil to the black wire that comes out of the fuse box.Do not use the black wire in the harness is too small of gauge

black and yellow is for starter
green and purple is for the fuel pump
green and brown = oil pressure
green= switch power
blue wire ...

From what read you are tring to convert your 79 635 to motronic 1.3 I did that with my 78 530i you can use a auto harness if the car you converting is manual you remove the auto stuff from the harness

here is a pics of it
http://tinypic.com/usermedia.php?uo=TCh ... h4l5k2TGxc

sound like your ignition control module could be faulty or check the connector that connects to the distributor i has a similar problem i have 530i but P.o installed the 528i system so the p.o sold the car because it would start sometimes it would not start similar to what you are talking I check ...

ok if you are getting spark and gas and but the does not start unless you spray carb cleaner in the air box that means you are not getting power to the injectors you need to check the combo relay is the double relay by the driver side and the injector ground cable is in the glove compartment a ...

I need to find the wiring diagrams for a 78 530 I looked every were online i could find e28's and up, but nobody has e12 stuff I wonder why

while building back the suspension on my 78 530 i was replacing shock towers from ones out of a 79 635 euro and when came to install the bearings and hub using the e12 bearings and hub the bearings would not go all the way in.. The bearings hub and shock tower are different so i go on realoem and ...

Yes how you describe it it sounds like your engine locked up as other suggest
Check if the engine is not stuck if the car has manual trans put it in 3rd gear and push the car ill be Little heavy that's because the car is in gear ans pay attention if the motor turns over if its ok check all fusses ...

Well for the harness you are going to need all connectors maybe without the purge valve for the. mainfold for the 530 has connections for the egr while the later ones dont have them i would try to use one out of a e12 528 for the conversion. For the tps use the one that comes with the harness and ...

I had almost the same problem i had change everything you said except the spark plug wires and one night it was pitch black and i had the hood open and i could see the current coming out of two wires that were too close to the engine bay and it miss fire every time it happened hope this helps

Check all your hoses it sounds like one of them is sucking air from some where check intake boot, intake runner gaskets throttle gasket. Make sure your dip stick is all the way in or ill run bad. If you have some carb cleaner while the car is on spry on your air hoses if one is leaking air you'll ...

i am ready to do the m 1.3 conversion using the m90 motor and someone told me don't do it because of the short stroke of the m90 while the b35 is long, and that i would not work. Is this true or they are full of !@#$. i got the tooth harmonic balance on it and the tdc marks line up the same as the ...

would a hone job do or i am !@##$ and need to re-bore

I m going to try to to the same thing the way i am tackle this project is use the faq e28 wiring to e12 on firstves web and the b35 faq on my e28 wich shows how to wire a e28 to e34 hope it helps

http://www.firstfives.org/faq/e28_wiring_conversion/E28_conversion.html

http://www.mye28.com/viewtopic ...

While i was taking out the m90 out my 78 530, I found differences between two m90 motors i have. The one in the car painted blue is out of a 78 635 and is a dual row timing chain and it has 3z stamped on the block, and the block looks thicker where the water plugs go compared to the one out of a 79 ...